while I get what you are saying, I don't think that translates over to this case very well. Everybody and their dog is already on Facebook. And G+ has really made no true dent in that, not even from the Interest (Graph) Network angle, which as has been said many times by myself and others, is nowhere near locked up.
But Google hasn't even made a serious play for it thus far with this. Quora and even Pinterest are doing a better job on that front as we speak (Quora has some other issues that have largely prevented mainstreaming), and that's saying something. There is no clear mantra from Google as to what G+ is/should be,
Scoble again pointed this out on a recent post ->plus.google.com/111091089527727420853/posts/PZrpGy796t2
"I've talked with hundreds of people about social apps over the past 10 days and I noticed something. Nearly everyone could define what Facebook, Twitter, and LinkedIn do. They could even define what Highlight, a new app that was being discovered by many at SXSW. But nearly no one could define what Google+ is. Here's how these conversations went:
What is Google+? Very few could answer that. Some, who are very active, can "it's a place to discuss things with other people passionate about the same things you are." Or "it's a way for Google to stitch together its services in a social way."
So, what can Google+ learn?
1. We need a reason that Google+ exists that we can tell other people. It needs to be clear, understandable, and commonly understood.
2. It's hard to define yourself when you hit up against a very entrenched competitor. So don't. Define a new space. That's why I liked Video Hangouts so much. They didn't go after Facebook, or even Skype. They let us do something new. Highlight is that for me.
3. Highlight proves that social networking innovation is NOT done (my new 900 friends on the service proves that)."